These two stretches of the Missouri River are the only parts of the river between Montana and the mouth of the Missouri that remain undammed or unchannelized.
The lake is approximately 25 miles (40 km) in length with over 90 miles (140 km) of shoreline and a maximum water depth of 45 feet (14 m). [2 ] The lake is impounded by Gavins Point Dam and is managed by the U.S.